Bending Model of an Integrated SMA Micro-Actuator

Abadie, Joël; Chaillet, Nicolas; Lexcellent, Christian

doi:10.1177/1045389x04042472

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…SHAPE-MEMORY alloys (SMA), e.g., NiTi alloy, have been widely used in aerospace, [1] biomedical, [2,3] and micro-eletro-mechanical system [4][5][6] fields, among others. The unique properties of SMA, such as the shape-memory effect, superelasticity, high damping capacity, and bio-compatibility, make it very useful in these fields.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Interface in a NiTi Short-Fiber-Reinforced 6061 Aluminum Composite by Transmission Electron Microscope

Liu

Almatar

Newaz

2008

Metall Mater Trans A

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It has already been demonstrated that NiTi shape-memory alloy fiber-reinforced composites show enhanced mechanical properties by adding a compressive stress to the matrix when the shape-memory effect is activated. The bonding quality between NiTi fiber and the matrix directly affects the stress transfer across the interface, through which the novel functionality of the smart composite is achieved. In the present study, the interface in a NiTi short-fiber-reinforced 6061 aluminum matrix has been investigated by transmission electron microscopy and energy dispersive spectroscopy. Three layers at the interface between NiTi fiber and 6061 aluminum alloy matrix have been found and characterized, i.e., Al 3 Ti with DO 22 ordered structure near the NiTi fiber, Al 9 FeNi with Al 9 Co 2 (or Al 9 Fe 2 ) type ordered structure near the Al alloy matrix, and Mg-O layer with 20 nm in thickness between Al 3 Ti and Al 9 FeNi layers. The potential effects of these layers on the mechanical properties of the composite are discussed. Evidence indicates that extensive diffusion from both NiTi fiber and Al alloy matrix occurred during the fabrication of the composite at 570°C to 580°C within 20 to 30 minutes. The minor elements in the matrix could be the major elements at the interface. By selecting the chemical composition of the Al alloy matrix, it is possible to control the chemical composition at the interface and further control the mechanical properties of the composites.

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Section: Introductionmentioning

confidence: 99%

An Investigation on the Interface in a NiTi Short-Fiber-Reinforced 6061 Aluminum Composite by Transmission Electron Microscope

Liu

Almatar

Newaz

2008

Metall Mater Trans A

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“…These results indicate that actuation time can be the major drawback of SMA actuators that uses convection as the heat removal mechanisms. Nevertheless, the performance can be improved with solutions using forced convection, special fluids with high capability of heat removal or mechanisms based on the Peltier-effect thermoelectric devices for selective local heating and cooling [29][30][31].…”

Section: Parametermentioning

confidence: 99%

Shape Memory Alloy Helical Springs Performance: Modeling and Experimental Analysis

Aguiar

Neto

Savi

et al. 2013

MSF

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Shape memory alloys (SMAs) are metallic materials that have the capability to recover its original shape eliminating residual strains when subjected to adequate thermal process. This behavior is related to phase transformation induced either by stress or by. During the phase transformation process of an SMA component, large loads and/or displacements can be generated in a relatively short period of time making this component an interesting mechanical actuator. Because of such remarkable properties, SMAs have found a number of applications in different areas. The present contribution deals with the modeling, simulation and experimental analysis of SMA helical springs. Basically, it is assumed a one-dimensional constitutive model to describe its thermomechanical shear behavior and, afterwards, helical springs are modeled by considering classical approach. SMA helical spring thermomechanical behavior is investigated through experimental tests performed at different loads. Numerical results show that the model is in close agreement with experimental data. Since the thermal process has an essential importance in the performance of an SMA actuator, different cooling medium conditions are investigated, evaluating the actuators performance.

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“…In this energy balance equation [16], the thermal power input from the heater dictates the rate of change of the volume fraction of martensite phase, z, and the temperature change, and the last term of the equation depends on the external temperature.…”

Section: Actuator Modelingmentioning

confidence: 99%

A bidirectional shape memory alloy folding actuator

Paik¹,

Wood²

2012

Smart Mater. Struct.

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This paper presents a low-profile bidirectional folding actuator based on annealed shape memory alloy sheets applicable for meso-and microscale systems. Despite the advantages of shape memory alloys-high strain, silent operation, and mechanical simplicity-their application is often limited to unidirectional operation. We present a bidirectional folding actuator that produces two opposing 180 • motions. A laser-patterned nickel alloy (Inconel 600) heater localizes actuation to the folding sections. The actuator has a thin (<1 mm) profile, making it appropriate for use in robotic origami. Various design parameters and fabrication variants are described and experimentally explored in the actuator prototype.

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Bending Model of an Integrated SMA Micro-Actuator

Cited by 7 publications

References 7 publications

An Investigation on the Interface in a NiTi Short-Fiber-Reinforced 6061 Aluminum Composite by Transmission Electron Microscope

An Investigation on the Interface in a NiTi Short-Fiber-Reinforced 6061 Aluminum Composite by Transmission Electron Microscope

Shape Memory Alloy Helical Springs Performance: Modeling and Experimental Analysis

A bidirectional shape memory alloy folding actuator

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